Appending a newline character to a string [closed]

Question

I'm trying to find a simplest solution to append a newline character to a string.

Although the following code works, I would like to know if it's possible to make the code simpler. (The argument should be const char* and not std::string)

My Code :

static void sysGui(const char *s)
{
    char buf[1000];
    std::strcpy(buf, s);
    std::size_t size = std::strlen(s);
    buf[size] = '\n';
    buf[size + 1] = '\0';
    sys_gui(buf);
}

Answer 1

If you're really certain of the necessary conditions for this to actually work, a somewhat cleaner way to do the job would be to use sprintf:

static void sysGui(const char *s)
{
    char buf[1000];
    sprintf(buf, "%s\n", s);
    sys_gui(buf);
}

You could use a std::ostringstream instead, but sprintf seems more in keeping with the fact that the rest of the code is essentially C anyway (regardless of how it's tagged).